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Newcastle got off to the perfect start when Aleksandar Mitrovic fired them into a third-minute lead, but Jason Cummings' double put the Reds in the driving seat until Rolando Aarons struck in first-half stoppage time.

But it was Forest substitute Tyler Walker who headed the Championship side to victory eight minutes into extra-time after Newcastle had dominated the second half, but failed to take any of their chances.

Asked if the result proved that the squad was not strong enough, Benitez, who is still hoping for significant movement both ways during what remains of the summer transfer window, said: "No, it proved that we have to improve in some areas."